In one of the chapters Matt Ridley concludes that chromosome 10 is related to stress. He relates chromosome 10 to stress by a small organic molecule called cholesterol that correlates to stress levels. The cholesterol gets manufactured in the body from sugars in the diet. This small organic molecule called cholesterol can form many steroids that have important functions in the body like‚ testosterone‚ cortisol‚ progesterone‚ aldosterone and oestradiol. Matt Ridley focuses on cortisol which causes
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nucleotide? (I = 2‚ C = 2) 6) Name five people and describe how they contributed to our current knowledge of DNA (their discovery/discoveries). (A = 5‚ C = 2) Mitosis 1) A cell with 10 chromosomes undergoes mitosis. Indicate how many chromosomes would be expected in each of the daughter cells. (I = 1‚ C = 2) 2) During interphase‚ what event must occur for the cell capable of undergoing future divisions? (A = 1‚ C = 2) 3) Using
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Characteristics to Compare | Items to be Compared (# 3 Description) | Similarities and/or Differences | | Asexual Reproduction | Sexual Reproduction | | Process Description | Mitotic division‚ requiring only one parent. Offspring are identical replicas of parent. Cell divides after DNA is replicated. No gametes are formed‚ can also occur by fragmentation (a piece of the organism breaking off) | Meiotic division. 2 parents are required. Each parent contributes ½ of the genetic
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and Catharanthus roseus (L.) Don. (periwinkle) were studied using iron-acetocarmine squash technique. The chromosome number of C. roseus is 2n=16 while both M. oleifera and E. pulcherrima have 2n=28. Although late disjunction and presence of laggards were noted at Metaphase I‚ Anaphase I and II‚ Telophase I and II were 100% normal. These would indicate that lagging chromosomes were able to catch up‚ reached the opposite poles‚ and were included in daughter nuclei. Highly normal meiosis
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mitosis but not cytokinesis. The result would be Student Response Value A. daughter cells that are unusually small. B. a cell with two nuclei. 100% C. a cell with one nucleus containing twice the normal number of chromosomes. D. daughter cells with too few chromosomes. E. daughter cells with no nucleus. Score: 1/1 7. Which of the following is the correct order of events in the cell cycle? Student Response Value A. S‚ G1‚ G2‚ cytokinesis‚ mitosis B. S‚ G1‚ G2‚ mitosis
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WAGR Syndrome WAGR (Wilms’ tumor‚ Aniridia‚ Genitourinary abnormalities‚ and mental Retardation) Syndrome is a contiguous gene deletion syndrome that is caused by a deletion in chromosome 11. The acronym for the syndrome comes from the various symptoms that are caused by the deletion – wilms’ tumor‚ aniridia‚ genitourinary abnormalities‚ and mental retardation. Wilms’ tumor is a tumor that is found in the kidneys that causes nephroblastoma‚ cancer of the kidneys. Aniridia‚ the absence of the iris
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Exam Review – January 2013 Diversity Unit - List taxonomic ranks in order. What is the significance of this order? Domain‚ Kingdom‚ Phylum‚ Class‚ Order‚ Family‚ Genus‚ Species. Classification of species: kingdoms contain many different types of organisms‚ each taxon contains progressively fewer types of organisms‚ taxon “species” is narrowest category‚ containing only one type of organism. As you go from kingdom to species‚ organisms share more and more in common. - Explain and give an example
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dominant inheritance – 1 parent carries the defective gene. The child has a 50% chance of inheriting the condition. An example of this would Huntington Disease. Dominant X-linked inheritance – this happens when a single abnormal gene on the X chromosome causes a disease. The abnormal gene dominates the gene pair. Although rare‚ an
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where an individual has an extra chromosome 13. Trisomy 13 was first recognized by Patau and his colleagues in 1960 (Matthews‚ 1999). It affects approximately 1 in 12‚000 births and is the least common of the trisomy syndromes‚ after trisomy 18 and trisomy 21 (Down syndrome). An abnormality of the chromosome occurs when mitosis or meiosis does not happen correctly. During mitosis‚ when the cells are dividing‚ chromosomes are either lost or gained. The chromosomes do not separate evenly. When the
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are packaged into chromosomes. 4) The nuclei of a human somatic cell (all body cells except the reproductive cells) each contain 46 chromosomes made up of two sets of 23‚ one set inherited from each parent. 5) Reproductive cells or gametes-sperm and eggs-have half as many chromosomes as somatic cells‚ or only one set of 23 chromosomes. 6) Eukaryotic chromosomes are made of chromatin‚ a complex of DNA and associated protein molecules. C. Distribution of Chromosomes During Eukaryotic
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